package com.sakura.eduservice.service.impl;

import cn.hutool.core.collection.CollectionUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.sakura.eduservice.pojo.entity.EduChapter;
import com.sakura.eduservice.mapper.EduChapterMapper;
import com.sakura.eduservice.pojo.entity.EduVideo;
import com.sakura.eduservice.pojo.vo.ChapterVo;
import com.sakura.eduservice.pojo.vo.VideoVo;
import com.sakura.eduservice.service.EduChapterService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sakura.eduservice.service.EduVideoService;
import com.sakura.grainacademy.servicebase.exceptionhandler.GuliException;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author sakura
 * @since 2022-11-15
 */
@Service
public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {

    @Autowired
    private EduVideoService videoService;//注入小节service

    //课程大纲列表,根据课程id进行查询
    @Override
    public List<ChapterVo> getChapterVideoByCourseId(String courseId) {

        //1 根据课程id查询课程里面所有的章节
        QueryWrapper<EduChapter> wrapperChapter = new QueryWrapper<>();
        wrapperChapter.eq("course_id", courseId);
        List<EduChapter> eduChapterList = baseMapper.selectList(wrapperChapter);

        //2 根据课程id查询课程里面所有的小节
        QueryWrapper<EduVideo> wrapperVideo = new QueryWrapper<>();
        wrapperVideo.eq("course_id", courseId);
        List<EduVideo> eduVideoList = videoService.list(wrapperVideo);

        //创建list集合，用于最终封装数据
        List<ChapterVo> finalList = new ArrayList<>();

        //3 遍历查询章节list集合进行封装
        //遍历查询章节list集合
        if (CollectionUtil.isNotEmpty(eduChapterList) && CollectionUtil.isNotEmpty(eduVideoList)) {
            for (int i = 0; i < eduChapterList.size(); i++) {
                //每个章节
                EduChapter eduChapter = eduChapterList.get(i);
                //eduChapter对象值复制到ChapterVo里面
                ChapterVo chapterVo = new ChapterVo();
                BeanUtils.copyProperties(eduChapter, chapterVo);
                //把chapterVo放到最终list集合
                finalList.add(chapterVo);


                //TODO 优化后
                //4 遍历查询小节list集合，进行封装
                List<VideoVo> collect = eduVideoList.stream().filter(video -> video.getChapterId().equals(eduChapter.getId())).map(video -> {
                    VideoVo videoVo = new VideoVo();
                    BeanUtils.copyProperties(video, videoVo);
                    return videoVo;
                }).collect(Collectors.toList());
                //把封装之后小节list集合，放到章节对象里面
                chapterVo.setChildren(collect);

                //TODO 优化前
                //创建集合，用于封装章节的小节
//                List<VideoVo> videoList = new ArrayList<>();
//                for (int m = 0; m < eduVideoList.size(); m++) {
//                    //得到每个小节
//                    EduVideo eduVideo = eduVideoList.get(m);
//                    //判断：小节里面chapterid和章节里面id是否一样
//                    if (eduVideo.getChapterId().equals(eduChapter.getId())) {
//                        //进行封装
//                        VideoVo videoVo = new VideoVo();
//                        BeanUtils.copyProperties(eduVideo, videoVo);
//                        //放到小节封装集合
//                        videoList.add(videoVo);
//                    }
////                }
//                //把封装之后小节list集合，放到章节对象里面
//                chapterVo.setChildren(videoList);
            }
        }

        return finalList;
    }

    ////删除章节的方法
    @Override
    public boolean deleteChapter(String chapterId) {
        //根据chapterid章节id 查询小节表，如果查询数据，不进行删除
        QueryWrapper<EduVideo> wrapper = new QueryWrapper<>();
        wrapper.eq("chapter_id", chapterId);
        int count = videoService.count(wrapper);
        //判断
        if (count > 0) {//查询出小节，不进行删除
            throw new GuliException(20001, "不能删除");
        } else { //不能查询数据，进行删除
            //删除章节
            int result = baseMapper.deleteById(chapterId);
            //成功  1>0   0>0
            return result > 0;
        }
    }

    //2 根据课程id删除章节
    @Override
    public void removeChapterByCourseId(String courseId) {
        QueryWrapper<EduChapter> wrapper = new QueryWrapper<>();
        wrapper.eq("course_id", courseId);
        baseMapper.delete(wrapper);
    }
}
